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Phase-Separation-Induced Porous Lithiophilic Polymer Coating for High-Efficiency Lithium Metal Batteries
- Source :
- Nano Letters. 21:4757-4764
- Publication Year :
- 2021
- Publisher :
- American Chemical Society (ACS), 2021.
-
Abstract
- Solid-electrolyte interphase (SEI) plays a pivotal role in stabilizing lithium (Li) metal anode for rechargeable batteries. However, electrolyte-derived SEI often suffers from poor stability, leading to Li dendrite growth, consumption of electrolyte, and short cycle life. Here, we report a porous lithiophilic polymer coating induced by phase separation of polyvinylidenefluoride-polyacrylonitrile (PVDF-PAN) blends for stabilizing Li metal anode. Different from single polymer coating, PVDF-PAN blends protective layer with porous structures caused by phase separation can provide effective Li+ transport channels and regulate uniform Li+ flux. The lithiophilic functional groups of C≡N and C-F can promote uniform Li deposition and accelerate Li+ diffusion at the same time during plating/stripping process. As a result, Li||NCM811 full cells using PVDF-PAN coated Li present an apparently improved cycling stability and higher Coulombic efficiency with lean electrolyte (7.5 μL mA h-1), limited Li supply (N/P ratio = 2.4), and high areal capacity (4.0 mA h cm-2).
- Subjects :
- Materials science
Stripping (chemistry)
Mechanical Engineering
Diffusion
chemistry.chemical_element
Bioengineering
02 engineering and technology
General Chemistry
Electrolyte
021001 nanoscience & nanotechnology
Condensed Matter Physics
chemistry
Chemical engineering
Plating
General Materials Science
Lithium
0210 nano-technology
Porosity
Layer (electronics)
Faraday efficiency
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi.dedup.....8cf6ca08d92762df553ad307ae4517a3